Without question, the best hope for a Skype-killer would be Jitsi. And
as great as it is, sadly, it's still very much an application "in
development." One might even suggest that it's cool if it works for
you, but it's nowhere near ready for production at this time. All of
that said, I firmly believe it will be Jitsi that provides the most
reliable option 2 to 4 years from now.
What makes Jitsi nice is that it supports a multitude of protocols.
This in itself isn't really new. After all, there are a number of
protocols available out of the box. But what makes Jitsi so cool is
that it offers some advanced VoIP features. The functionality that
struck me is the HD video quality during my calls, and the security
with encryption, by default. Bundle this with call transferring and
call recording, it's easy to see why I'm so excited about the idea
behind Jitsi in the long term.
So, what items need work? First, it needs to be stable to use. At this
time, Jitsi has been known to crash. Also, it lacks group video calls
on the free application. It seems the bulk of their recent development
time has gone into a video bridge product, which is basically just a